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arXiv 1902.03260hep-th
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BMS4代数及其稳定性和变形

BMS4 Algebra, Its Stability and Deformations

H. R. Safari, M. M. Sheikh-Jabbari

摘要:

我们继续分析了\cite{Parsa:2018kys},并研究了BMS 4代数及其中心扩展形式的刚性和稳定性。我们构造和分类的家庭代数出现的变形的BMS 4和一般发现四参数家庭代数W(a,b; \bar{a},\bar{b})作为结果的稳定性分析,其中BMS 4 = W(-1/2,-1/2;-1/2,-1/2)。然后研究了W(a,b; \bar{a},\bar{b})代数,它的极大有限子群以及对不同参数值的稳定性.证明了W(a,b; \bar{a},\bar{b})代数族对参数的一般值的稳定性.对于(a,b)=(\bar{a},\bar{b})=(0,0)和(a,b)=(0,-1),(\bar{a},\bar{b})=(0,0)的特殊情况,代数可以变形。特别地,我们证明了中心扩展W(0,-1; 0,0)代数可以变形为一个有三个Virasoro副本的代数.我们简要地讨论了这些变形代数作为渐近对称代数的稳定性的物理意义和我们的结果的含义。

英文摘要:

We continue analysis of \cite{Parsa:2018kys} and study rigidity and stability of the BMS4 algebra and its centrally extended version. We construct and classify the family of algebras which appear as deformations of BMS4 and in general find the four-parameter family of algebras W(a,b;\bar{a},\bar{b}) as a result of the stabilization analysis, where BMS4=W(-1/2,-1/2;-1/2,-1/2). We then study the W(a,b;\bar{a},\bar{b}) algebra, its maximal finite subgroups and stability for different values of the four parameters. We prove stability of the W(a,b;\bar{a},\bar{b}) family of algebras for generic values of the parameters. For special cases of (a,b)=(\bar{a},\bar{b})=(0,0) and (a,b)=(0,-1), (\bar{a},\bar{b})=(0,0) the algebra can be deformed. In particular we show that centrally extended W(0,-1;0,0) algebra can be deformed to an algebra which has three copies of Virasoro as a subalgebra. We briefly discuss these deformed algebras as asymptotic symmetry algebras and the physical meaning of the stabilization and implications of our result.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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